officials have confirmed they met with representatives of moammar gadhafi's regime last weekend. three senior u.s. diplomats met with gadhafi advisers on saturday in an unnamed country. u.s. officials say the meeting was not a negotiation, but that they delivered a clear and firm message. gadhafi must step down. >>> here at home, another giant dust storm rolled over phoenix, arizona. the giant wall of dust was pushed by wind gusts of up to 40 miles per hour, and rose some 3,000 feet into the air. in some areas, visibility was less than a quarter of a mile. some airline flights were even delayed. this dust storm was not as strong as the one that hit earlier this month. >>> the dangerous heat wave continues to grip much of the central u.s., as it begins to move east. the high temperatures and humidity are expected to continue for the first of the week. the rest of the week, as well. manuel gallegus reports. >> reporter: from the northeast, to the plains, to the south, americans are sweltering. and doing whatever they can to keep cool. if your job is outside, you get creative. >> i